Sheryl Sandberg sells $91 million of Facebook stock

Sheryl Sandberg is leaning into a big new pile of money now that Wall Street's finally giving Facebook some love.

The Facebook(FB) chief operating officer and author of the much buzzed-about "Lean In" sold nearly 2.4 million shares of the social network's stock last week at an average price of $38 per share, according to a regulatory filing.

Sandberg is using a pre-arranged trading plan, which means she has no control over the specific timing of her sales. Such plans are a common way for top executives to cash in on a portion of their holdings while avoiding accusations of insider trading.

Her move this time came just a week after Facebook shares rose above $38 a share Wednesday for the first time since the social network went public in May 2012. The stock has clawed back from a low $17.55 in September.